$$13/18-2/3$$
$\frac{1}{18}\approx 0.055555556$
$$\frac{13}{18}-\frac{12}{18}$$
$$\frac{13-12}{18}$$
$$\frac{1}{18}$$
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$\frac{1}{2 \cdot 3 ^ {2}} = 0.05555555555555555$